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Finding the Fourth Proportional to 970.92, 1,340.07 and 639.37

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Solution

The fourth proportional to 970.92, 1,340.07 and 639.37 is: 882.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.92 : 1,340.07 = 639.37 : x
  2. Step 2: Convert to fraction form
    970.92/1,340.07 = 639.37/x
  3. Step 3: Cross multiply
    970.92x = 1,340.07 × 639.37
  4. Step 4: Simplify right side
    970.92x = 856,800.56
  5. Step 5: Solve for x
    x = 856,800.56/970.92
  6. Step 6: Final answer
    x = 882.46

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.